Cleaning a safety razor

mix a solution of 1 part vinegar and 4 parts water and place the razor in the solution.

Does it matter what type of vinegar?

I think once a week I'll soak the razor in a vinegar and water solution and then I'll scrub it with a toothbrush and liquid dish washing soap. Would this be a good routine?

Are you cleaning your razors for 1) sanitary reasons 2) remove soap scum - better shave? 3) cosmetic

Many good and diverse routines posted. Blackland makes razors and might be worth reading a 2nd time. If many-user shared bathroom, sanitary would rank higher. You should also consider the long term cosmetic impact on the razor with frequent brushing and chemicals.

Are you cleaning your razors for 1) sanitary reasons  2) remove soap scum -  better shave?  3) cosmetic

Many good and diverse routines posted.  Blackland makes razors and might be worth reading a 2nd time.  If many-user shared bathroom, sanitary would rank higher.  You should also consider the long term cosmetic impact on the razor with frequent brushing and chemicals.

For all the 3 reasons.

I've also been told to never use vinegar on a safety razor. What do you guys think?

if I get a cruddy razor that I bought on ebay or found in an antique store that I plan on using or possibly keeping, I'll give it a wash in warm soapy water using a toothbrush. if that doesn't clean it well enough for my liking, I'll spray it down with some scrubbing bubbles, let it sit for a little bit and then scrub it with a toothbrush, following it up with another warm soapy water bath..

if I want to sanitize a razor, I'll just throw it in my phone soap for 10 minutes and let it do its thing...it kills something like 99.9% of bacteria and such.

Scrubbing Bubbles and a soft nylon toothbrush works well for me

Vinegar typically contains 5–8% acetic acid by volume. Vinegar is mildly acidic with a pH of 2–3 (depends on type of vinegar). Diluting with water does reduce the acidic level.

While I loved High School Chemisty, I am not qualified to speak on the long term effects of vinegar on various shaving razor materials (SS, Titanium. Zarmac, Aluminum, Copper, etc.). There are other methods to clean/sanitize razors without a weekly dose of acid.

Maybe I should use the 1 part vinegar and 4 parts water solution once a month only.

Assuming these are razors you already own and use, I think you're overdoing it. Razors really don't need to be cleaned that often or that extensively. A rinse and maybe a wipe with a towel after every shave. For actual cleaning, dish soap and a soft cloth/towel is all you'll need 99% of the time. Avoid abrasives like toothpaste or polishes unless you really need it. For what it's worth, I almost never really deep clean my personal razors. Maybe 2-4 times a year will they get the soap treatment.

I have to agree with Shane on this one.